Feature/rate tempearture dependence

docs/user-guide/code-generation/template-syntax.md

@@ -303,6 +303,14 @@ These iterate plain value lists.
 | `element_density_matrix` | `element` |
 | `element_truth_matrix`   | `element` |
 
+**Radiation:**
+
+| Collection             | Variable             |
+| ---------------------- | -------------------- |
+| `radiation_boundaries` | `radiation_boundary` |
+
+Band edges, of length `nbands + 1`. Empty if the network has no radiation.
+
 ---
 
 ## GET

src/jaff/codegen/_template_engine.py

@@ -1509,6 +1509,12 @@ def __get_parser_dict(self) -> dict[str, CommandProps]:
                         "func": lambda: self.net.species.charged("mass"),
                         "vars": ["idx", "charged_specie_mass"],
                     },
+                    "radiation_boundaries": {
+                        "func": lambda: (
+                            self.net.radiation.bands if self.net.radiation else []
+                        ),
+                        "vars": ["idx", "radiation_boundary"],
+                    },
                 },
             },
             "REDUCE": {